Please help me!!!
Choose the correct form: present perfect or present perfect continuous.

1) She
has gossiped
has been gossiping
about me, hasn't she? I can just feel it.

2) Our company
has doubled
has been doubling
its turnover over the past six months.

3)
Have you smoked?
Have you been smoking?
Your breath smells awful.

4) I
have often been telling
have often told
her to be extra careful when opening the car door. I'm not really surprised to hear that she hit a pedestrian.

5) I
have done
have been doing
paperwork all day. In all, I guess I have signed about 65 letters.

I don't understand anything!!!